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108 lines
3.1 KiB
108 lines
3.1 KiB
// Package pretty provides pretty-printing for Go values. This is
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// useful during debugging, to avoid wrapping long output lines in
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// the terminal.
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//
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// It provides a function, Formatter, that can be used with any
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// function that accepts a format string. It also provides
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// convenience wrappers for functions in packages fmt and log.
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package pretty
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import (
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"fmt"
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"io"
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"log"
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"reflect"
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)
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// Errorf is a convenience wrapper for fmt.Errorf.
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//
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// Calling Errorf(f, x, y) is equivalent to
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// fmt.Errorf(f, Formatter(x), Formatter(y)).
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func Errorf(format string, a ...interface{}) error {
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return fmt.Errorf(format, wrap(a, false)...)
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}
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// Fprintf is a convenience wrapper for fmt.Fprintf.
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//
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// Calling Fprintf(w, f, x, y) is equivalent to
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// fmt.Fprintf(w, f, Formatter(x), Formatter(y)).
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func Fprintf(w io.Writer, format string, a ...interface{}) (n int, error error) {
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return fmt.Fprintf(w, format, wrap(a, false)...)
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}
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// Log is a convenience wrapper for log.Printf.
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//
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// Calling Log(x, y) is equivalent to
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// log.Print(Formatter(x), Formatter(y)), but each operand is
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// formatted with "%# v".
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func Log(a ...interface{}) {
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log.Print(wrap(a, true)...)
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}
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// Logf is a convenience wrapper for log.Printf.
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//
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// Calling Logf(f, x, y) is equivalent to
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// log.Printf(f, Formatter(x), Formatter(y)).
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func Logf(format string, a ...interface{}) {
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log.Printf(format, wrap(a, false)...)
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}
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// Logln is a convenience wrapper for log.Printf.
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//
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// Calling Logln(x, y) is equivalent to
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// log.Println(Formatter(x), Formatter(y)), but each operand is
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// formatted with "%# v".
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func Logln(a ...interface{}) {
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log.Println(wrap(a, true)...)
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}
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// Print pretty-prints its operands and writes to standard output.
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//
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// Calling Print(x, y) is equivalent to
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// fmt.Print(Formatter(x), Formatter(y)), but each operand is
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// formatted with "%# v".
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func Print(a ...interface{}) (n int, errno error) {
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return fmt.Print(wrap(a, true)...)
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}
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// Printf is a convenience wrapper for fmt.Printf.
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//
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// Calling Printf(f, x, y) is equivalent to
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// fmt.Printf(f, Formatter(x), Formatter(y)).
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func Printf(format string, a ...interface{}) (n int, errno error) {
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return fmt.Printf(format, wrap(a, false)...)
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}
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// Println pretty-prints its operands and writes to standard output.
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//
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// Calling Print(x, y) is equivalent to
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// fmt.Println(Formatter(x), Formatter(y)), but each operand is
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// formatted with "%# v".
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func Println(a ...interface{}) (n int, errno error) {
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return fmt.Println(wrap(a, true)...)
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}
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// Sprint is a convenience wrapper for fmt.Sprintf.
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//
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// Calling Sprint(x, y) is equivalent to
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// fmt.Sprint(Formatter(x), Formatter(y)), but each operand is
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// formatted with "%# v".
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func Sprint(a ...interface{}) string {
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return fmt.Sprint(wrap(a, true)...)
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}
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// Sprintf is a convenience wrapper for fmt.Sprintf.
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//
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// Calling Sprintf(f, x, y) is equivalent to
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// fmt.Sprintf(f, Formatter(x), Formatter(y)).
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func Sprintf(format string, a ...interface{}) string {
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return fmt.Sprintf(format, wrap(a, false)...)
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}
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func wrap(a []interface{}, force bool) []interface{} {
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w := make([]interface{}, len(a))
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for i, x := range a {
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w[i] = formatter{v: reflect.ValueOf(x), force: force}
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}
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return w
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}
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